-tree bbbee bcell be-er bebel beber becel beebe beeft beele beete beffe belce belec belee belef belet bellb belle berbe berec berel beret berle berre berte betee betel beter betle betre bett- bette bleer bleet bleft blere blete brece breef breel breer breet brell brere brett brrrr btc-e btr-t c-tec cbeff cbeft ccccc ccell ccett cclef ccrcl ccrel cctrl cebec ceber ceele ceere celeb celer cell- celle celte cerc- cerce cerec cerer ceret cerre certe cette cfler clcff cleef cleer cleet clefe cleft clerc clere clete clett crebe crece creel creer creft crele crell crete crrel ctcfl ctree ctrlc cttee ebber ebbet ebble ebell eberl ebert eccle ectfe eeeee eeler efere efetf effer effet eftel efter elect eleet elele ellel eller ellet elrec erbbe erber erect erere erte ertel erter etete etree ettel etter ettle fclef febel feble febre feele feere felce felet felle felte feltt ferce ferel feret ferle ferr- ferre ferte fetel feter fette flect fleer fleet flere flert flete flett freel freer freet frere frett ft-lb ftlee ftrtt lebce lebec lebel leber lebet lecce leece leell leere leert leffe leftb lelle lerer letbe letre lette rebbe rebec rebel reber rebet recce recet rect- recte reece reefe reeft reere refel refer refet reffe relee relet relte rere- reree reret retee retel reter rette tbtbt tcell teber tebet tectb teele teell tefe telce tele- telec teler tell- telle terce teret terre tert- tetel teter tetle tetr- tette tlell tlett tllbr treer treet trefe treff trele trere trete trett ttttt